报告介绍 报告摘要： 　　With recent developments of sophisticated experimental techniques and advanced theoretical methods, the fields of molecular spectroscopy and chemical dynamics have reached to the point that theory‒experiment comparisons can be made at a quantitative level. Such comparisons are normally made in terms of some experimental observables, such as the spectrum, cross section, or the pr...

报告介绍 Abstract： Phononic crystals, i.e. composite materials in which a periodic distribution of elastic parameters facilitates control of the propagation of phonons, hold the promise to enable transformative material technologies in areas ranging from acoustic and thermal cloaking to thermoelectric devices. Realizing these opportunities requires strategies to deliberately ‘engineer’ the phono...

报告介绍 报告摘要： 自唐本忠院士首次提出聚集诱导发射（AIE）概念以来，AIE的研究已经成为研究前沿热点，各种功能AIE分子被设计，表现出了独特的性能，已被广泛应用于有机光电子学、生物医学等领域。围绕分子结构、聚集形态与发光关系，本工作提出了利用阴离子-π+相互作用阻隔π-π堆积以及限制分子内运动构建新型离子型AIE分子，并调控出纯有机室温磷光以及单分子白光。发现了一种基于非传统区域选择性光环化反应的光活化机制，构建...

报告介绍 Abstract：　　We recently developed a correlation matrix renormalization (CMR) theory to treat the electronic correlation effects in ground state total energy calculations of molecular and condensed systems using Gutzwiller variational wavefunction (GWF). The CMR method goes beyond the conventional Gutzwiller approximation and incorporates Coulomb interactions between two localized electrons on diff...

报告介绍 Abstract　　Strongly-correlated cold atoms provide a powerful tool for studying quantum many-body physics and the nature of entanglement. I will describe two promising platforms for these goals. The first part of this talk will present an experiment on spin transport in an optical lattice. Using a microscope with single-atom resolution, we watch atoms of different spins move through the lattice unde...

报告介绍 Abstract： 　　Gathering molecular-level information about electrochemical interfaces is highly desirable to advance or understanding of - and to ultimately design and control - efficient electrochemical processes that underly a manifold of ‘green’ energy conversion applications, such as fuel cell or sensitised solar cell operation, electrosynthesis and electrocatalysis or physiological ...

报告介绍 报告人简介：　　Professor Ajayan earned his B. Tech in metallurgical engineering from Banaras Hindu University in 1985 and Ph.D. in materials science and engineering from Northwestern University in 1989. He is the Benjamin M. and Mary Greenwood Anderson Professor at Rice University, and the founding chair of the new department of Materials Science and NanoEngineering at Rice University. His research...

报告介绍 Abstract: 　　We discover surprising consequences of the well-known quantum effects such as zero-point energies, superposition and interferences of quantum states, tunneling, and constraints imposed by nuclear spins. The examples include a new type of chemical bonding: "vibrational bonding" stabilizes BrMuBr at its low, broad transition state due to the reduction of vibrational zero p...

报告介绍 Abstract： The controllable synthesis of high quality low-dimensional materials, such as carbon nanotubes and graphene, is highly desired for both fundamental researches and their industrial applications. In the past, we have paid great efforts to explore the mechanism of low-dimensional materials’ growth and the potential routes towards the controllable synthesis of the desired materials. In ...

报告介绍 Abstract：　　Two essential ingredients in macroscopic Maxwell equations are the electric and magnetic dipole. Their spatial variations generate a localized charge and current distribution, respectively. However, it turns out to be a difficult task to calculate these two quantities in periodic crystals. The valid theory for electric polarization is given in PRB 47 1651(1993), and that for orbital ma...

报告介绍 Abstract：　　Understanding the cation incorporation into copper sulfide nanocrystals (NCs) process has become a major emphasis in our research group. In one recent study, we prepared unique biconcave djurleite Cu1.94S nanoplatelets (NPls) from template CuInS2 (CIS) NPls via a cation exchange (CE) reaction. We also prepared different heterostructures by incorporating different amounts of Ag+ into co...

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报告介绍 Abstract： Effective spin current manipulation is the key process to realize the spin-based transistor and unfortunately proved to be quite challenging in the electron-based spin channels, in which the propagation of spin current relies on the isotropic electron diffusion. Recent works show that spin can transmit through antiferromagnetic insulators [1,2], in which itinerant electrons cann...

报告介绍 Abstract： A huge recent progress in the sample quality makes many-body effects in electron spectrum of graphene near neutrality point observable. Model approaches for the Dirac electrons with Coulomb interaction were intensively developed in the last ten years. I am going to focus, rather, on materials-science aspects of the problem, including first-principles calculations of effective Coulomb inte...

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报告介绍 Abstract：Energy and environment are the two main themes nowadays for sustainable development of human society. The depletion of fossil energy and environmental pollution have aroused serious concerns worldwide. Materials paly crucial rules in advancing new technologies, which have been witnessed in a wide range of industries over the past a few decades. Material property largely depends on its stru...